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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0942c909575c53ba58bf57934a37a7f4f098d16a340cc7140efe3a5be47cc39' 
  AND token = 'DRlsGY4jBlhBSCLe6YgBeYoA01Y/xHs3VF6muFA8llc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}